In this mode, the length is written by the AXI4-Stream FIFO core when the complete packet is received across the RX AXI4-Stream interface. The width of the RLR is wide enough to support packets up to 8 MBytes–4 (8388604) in length. The smallest packet that can be received is 1 byte. The maximum packet that can be received is limited by the size of the FIFO, which is (C_RX_FIFO_DEPTH–4)*(data interface width/8) bytes.
Figure 1. Receive Length Register: Store-and-Forward Mode (Offset 0x24)
| Bit(s) | Name | Core Access | Reset Value | Description |
|---|---|---|---|---|
| 22:0 | RXL | Read | 0x0 | Receive Length : The number of bytes of the corresponding receive data stored in the receive data FIFO. |
| 31:23 | Reserved | Read | 0x0 | Reserved : These bits are reserved for future definition and always return all zeros. |